Electric elevator machine



Feb. 19, 1929. 1,702,514

D. LINDQUIST ET AL ELECTRIC ELEVATOR MACHINE Filed May 25, 1925 4Sheets-$heet 1 Feb. 19, 1929. 1,702,514

D. L ITINDQUIST ET AL ELECTRI C ELEVATOR MACHINE Filed May 23, 1923 4Sheets-Sheet 2 @qfl 6111001401 5 Feb. 19, 1929.

1,702,514 D. LINDQUIST ET AL ELECTRIC ELEVATOR MACHINE Filed May 23,1923 4 Sheets-Sheet 3 HQ 38 a4 43 aw: flu fi I Feb. 19, 1929.

D. L. LINDQUIST ET AL ELECTRIC ELEVATOR MACHINE Filed May 23, 1923 4Sheets-Sheet 4 w?? a n abto'ammg if able in operation.

Patented Feb. 19, 1929.

UNITED STATE-S PATENT OFFICE.

DAVID L. LINDQUIST, OF HARTSDALE, AND GEORGE W. LAUTRUP, O]? YONKERS,NEW YORK, ASSIGNORS T0 OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEWJERSEY,

A CORPORATION OF NEW JERSEY.

Application filed Kay 23,

Our invention relates to an improved main and auxiliary drive electricelevator machine.

In the combined main and auxiliary drive electric elevator machine ofthe self-leveling type for gearless traction elevators, the machinecomprises a driving sheave directly connected to the motor shaft of-themain motor and operatively connected through i'rictio'n mechanism andworm gearing to the shaft of the auxiliary drive motor, the latterhaving a brake associated with it.

One feature of the invention is the provision of such mechanism which isof simple and compact. construction and which is reli- Another feature1s the provision of such mechanism in which lost motion is eliminated,in'which wear is reduced to a minimum and which may be readily adjusted.

Other features and advantages will be ap. parent from the followingdescription and appended claims.

In the drawings:

Figure 1 is an elevation view of one side of the combined machine.

Figure 2 is a plan view of the machine.

Figure 3 is an enlarged vertical cross-sec-' tional view of'the machine.

Figure 4 is a view of the friction mocha nism as seen from the side ofthe machine by a vertical cut through the casing.

Figure 5 is an enlarged view of a part of F'gure 4.

Figure 6 is another view of the friction mechanism as seen from themachine side,

but only partly assembled. Figure 7 is an end view of Figure 6.

Similarreference characters and numerals refer to similar partsthroughout the several views.

The combined elevator machine in its integral entirety is mounted on abed plate 1, common to both the main and auxiliary'ma chines. In thefact of both machines being mounted on one and the same bed plate,alignment of the two machines with each other and those parts of the twomachines combined with each other or mounted on the bed plate is therebymaintained and also with the utmost rigidity. There are main bearingsand bearing stands, 2 and 9, and 3 and 10. respec 1928. Serial No.640,832.

stands that the load is concentrated. In the case of our invention, onlytwo beams are.

required to support the common bed plate and combined machines, one ofthese beams designated 4being shown in Figure 1, the combined machine asan integral apparatus being placed on the two beams so that the bearingstands, 3 and 10, are directly over them. The load on the machine beingconcentrated on the bearingsand the stands being directly over the twosets of beams, it will be appreciated that, consequently, if anydeflection of the two sets of beams occurs which may not be avoided,there will be the least tendency to distort the bed plate or strain thealignment of the two machines with each other.

The main motor A has the customary field frame, 5, bolted to the bedplate, and ole pieces of the usual construction, and eld coils, 7, of anew construction which combines maximum ventilation and radiation andare finished off in appearance. Brushes 11 are carried by arms 8 of thebrush riggin The main motor A has. a hollow cast stee armature shaft,12, which serves as the elevator motors, as will appear hereinafter. Thetwo ends-of the shaft are journaled in thejournal bearings, .2 and 9, ofthe self-aligning type lined with high grade babbitt and lubricated bymeans of oil chains. The bearings are made as oil tight as possible andare provided with oil gages (not shown). The journal bearings, 2 and 9,are supported in the two main bearings stands, 3 and 10, and bolted tothe bed plate; one of the stands is at the edge or near the edge of oneside of the bed plate and the other stand is between a drivmg sheave-Oand the friction mechanism B, hereinafter described. The relativeositions of the' two. main bearing stan is plainly shown in Figures 2and 3. The armature laminations, 13, and commutator, 14, are allsecurely fastened to the hollow armature shaft. It will be observed, seeFigure 3, that the commutator and the bearing, 2, for one end of thearmature shaft are let into each other, as it were, which enables thelength of the machine to be lessened in efi'ect as it were to the extentof the distance that these two parts are let into each other. On theother end of the armature shaft near its middle there is firmly securedthereto a driv ing or hoisting sheave O. At the end of the armatureshaft, next to the sheave, is a friction pulley, or wheel, 16, securelyfastened to the end of the shaft by bolts, 17. The peripheral surface ofthe friction wheel is adapted to be engaged by a pair of friction shoes,18, when applied to its peripheral surface in the operation of theelevator. Each friction shoe is pivoted at 19 to its correspondingoperating arm 20, and each arm is pivoted by pins, 21, toa casing, 22,which is adapted to revolve about the axis of the armature shaft andcovers the entire friction mechanism. The operating arms are of caststeel, and the friction shoes are lined with asbestos metallic frictionblock material which is practically incompressible and has a highcoefficient of friction which remains almost constant over a widerange'of speed of the friction wheel, temperature and wear.

The casing 22 has hand holes 68 in it, see Figure 7, through whichaccess to the friction mechanism is had to adjust it. A set screw, 23,in each operating arm is used to adjust the friction shoe to the surfaceof the friction wheel in order that the curved surface of the shoe mayadapt itself to the curved surface of the periphery of the wheel. Thereis a bolt, 24, in each operating arm and fastened to its respective shoeand having a spring, 25, each set in a cut-out ortion, 26, of the arms.Thus the shoe to wliich each bolt is fastened is pulled against the setscrew, holding the shoe fixed. There is an abutting stud, 27, held byand between the operating arms at their pivot ends, and which has anexpansion spring, 28, and nuts 15 thereon'and is adapted by theexpansion of the spring to take up any lost motion that may occurbetween the arms and their pivot pins, 21, by reason of the journalbearings of the armsor their pins wearing away. At the opposite endsofthe operating arms are powerful helical springs, 29, which are adaptedto act through the arms on the shoe of each, tending to apply or forcethe shoes into frictional engagement with the friction 'wheel, 16. Thesprings are held on a rod, 30,

moved between the rollers, and thereby move the adjusting lovers inopposite directions, the movement being transmitted to the operatingarms, and they acting against thensprings, 29, by their movement effectthe release of the friction shoes from engagement with the frictionwheel, 6. The wedge shaped cam, 38, is a part of a movable combinedmagnet arm and core, 40, which is hinged by a pin, 41, to an end plate,42, of the revoluble frame or casing, 22, of the friction mechanism, andits swinging motion is limited by a stop on said end plate. The stopconsists of a rod, 43, one end fast in the plate, 42, and the other endpassed loosely through the magnet arm and core, 40, with an adjustingnut, 44, on its free end and a coiled spring, 45, on the-rod between themagnet arm and nut limits its outward movement when it is'released. Akick-off spring, 46, in the end plate, 42, helps in the operation ofreleasing the combined magnet arm and core, 40. stationary magnet, 47held in a combined casing and stand, 48, is adapted to operate thecombined magnet arm and core, 40,

to release the friction shoes, 18, from the w friction wheel, 16, thesaid magnet when energized attracting the combined magnet arm and coreat its core part, it having a cone, 49, formed thereon which moves in arecess, 50, in the stationary core, 51, of the magnet formed for itsreception. In Figure 3 the arm and core, 40, are shown in position whenattracted by the magnet, 47 It will be observed that an air gap is shownbetween the stationary magnet and magnet arm and core or in other wordsthat there is no mechanical contact between the stationary magnet andthe magnet arm and core, which means that the magnet arm and core arefree at all times to revolve without having mechanical contact with anypartof the stationary magnet. The lack of contact between the magnet armand core and magnet and armature core are fastened to a I stationarystand and the force from the magnet armature is transmitted mechanicallythrough sliding members to the friction mechanism. With the above partsand their relative arrangement, it is plain that a desired or suitableclearance can be established between the wheel and shoes, the amount ofwhich clearance is determined upon in the initial adjustment of theshoes to the wheel. It is also plain that when wear between the wheeland shoes occurs that the amount of clearance between wheel and shoes ischanged or increased from the initial or original clearance established,,but that the initial or original amount of clearance can bere-established by simply backing out the adjusting screws 35 in theoperating arms 20, thereby allowing the free ends of the arms toapproach each other toallow fora proper clearance between the wheel andshoes. By that means of adjustment the set or adjusted; position betweenthe armature core and the stationary magnet is maintained withoutdisturbance. It

will be perceived of course that the adjust? ment for proper clearancecan also be made by adjusting the stop comprising the rod, 43,

arm to closed position when the magnet, 47

releases its hold on the armature and core, 40, and its pressure on therod, 52, to hold the switch open. The friction mechanism just describedis designed to have the utmost rigidity and perfection of operation, andthus insure its greatest efficiency. As already stated, it rotates as awhole; but the magnet core, 51, and magnet winding, 47, arestationaryand do not rotate. The casing, 22, rotates over a surface, 58,on the bearing stand, 10. The end plate, 42, which is fastened to thecasing by bolts, 59, as shown in Figure 7, rotates over a surface, 60,on the magnet -winding casing and stand, 48. The magnet winding casingand stand serve also in part v purpose'in bringing the car to rest at alandas a cover for a gear, 61, on the casing, 22, an additional cover,62, covering the other part of the gear, and also a pinion car, 63, withwhich said gear, 61, meshes. Ihe observation was made above that in theembodi ment of our invention as to both the structural design andrelative arrangement of the commutator 14 and bearing 2, for one end ofthe armature shaft, that they are tucked or let into each other as itwere, thereby and to the extent that they are let into reducing thelength of the machine. It is to be observed also that the hoistingsheave or drive wheel,

C, is placed as close to the armature lamina-.

tions as good practice will allow, and the hear,- ing for the revolvingframe is let into the drive wheel as much as possible, whereby to theextent of the distance thus gained shortening that end or length of thearmature shaft,

and consequently the length of themachine.

Again it will .be noted that the revolving frame completely overhangsthe friction wheel or pulley, and operating arms and friction shoes andpartially the releasing magnet, the said relative arrangement of eachand all of. said elements to reduce the total length of the machine tobring its length within the distance from the centers of the averagehatchwa-ys for this typeof machine with its necessary length involved inits necessary load duty for the given job.. The pinion gear, 63, is faston a stud shaft, 64, journaled in a frame, 65, extended from the magnetwinding casing and stand, 48, and like it is securely bolted to the bedplate. The pinion gear is a fibroid pinion, accurately cut to mesh withthe gear, 61, on the revoluble casing. The use of fibroid for the piniongear insures noiseless operation of the gear,

which moves at slow speed. As before stated, the gear is covered with agear uard or casing, the person, and also serves to improve the generalappearance of the machine. On the opposite 'I1d of the shaft carryingthe pinion gear is fast thereon a worm gear wheel, 66, which is-alsocovered with a gear. guard or casing. Meshing with the worm gear wheel,66,'is a. worm enclosed in a housing, and fast on the end of a shaft,68, of the armature (not which serves to avoid accidents to shown, butconclusively presumed) of a motor D, whichis securely bolted to the oneand same bed plate to which the main hoisting motorA is fastened, asalready related. The motor D is a slow speed motor, and serves as themicro-drive motor for the elevator, and 4 also as the motor'forautomatically leveling the elevator ear with a. floor landing. When thefriction shoes are applied to thefriction wheel on the main motorarmature shaft and the micro-drive motor, D, is operated, it serves tooperate the drive pulley or sheave and the elevator, A brake E is forstopplng the motor D and the machine.

' The friction mechanism serves a double ing in that it first acts as abrake to bring the car to a low speed and then as a clutch forconnecting the leveling motor. D to the drivwhich is in appliedposition. Consequently,

upon' the deenergization of magnet winding 47 so that shoes 18 vmayengage the friction wheel 16 the car will be brought to rest by thebraking action of the friction mechanism B.

- The leveling machine can be used to marked advantage for the operationof lifting safes. The entire operation may be made with the auxiliarymotor. If it be found that the friction mechanism is not set tightenough to lift the safe, all that need be done is to set the frictionmechanism sufficiently tight to lift the safe. In the usual elevator thesafe may be lifted, but when the elevator is stopped, it

may be discovered that the brake will not hold the car; whereas, in thecase of the leveling elevator it is plain that, if the friction mechani'sm is sufliciently'tight to lift the safe, it is necessarilysufficiently tight to hold the safe when the-elevator stops; therefore,it is perceived that the leveling elevator has a marked arm for takingup any lost motion of the arm on its pivot.

2. In combination, a rotatable drum, friction shoes for cooperating withsaid drum,

' drum.

. and for causing said shoe to exert a pressure 4. In combination, arotatable drum, a pivoted arm, a friction shoe pivoted on said arm forcooperation with said drum, means for adjusting said shoe to thecurvature of said drum, and resilient means for yieldingly maintainingsaid shoe in its adjusted position on its pivot point in adirection awayfrom said drum.

5. In combination, a rotatable drum, a pivoted arm, a friction shoepivoted on said arm for cooperation with said drum, a screw extendingthrough said arm into abutting rela- 1 tion with said shoe on one sideof the pivot point for said shoe, said screw being adjustable to adjustthe shoe to the curvature of said drum, a rod extending through said armand secured at one end to .said shoe between said screw and the pivotpoint for said shoe, a retainer on the other end of said rod, and acompression spring arranged on said rod between said arm and saidretainer to yieldingly maintain said shoe in its adjusted position inabutting relation with said screw and to cause said shoe to exert apressure on its pivot point in a direction away from said drum.

6. In combination, a drum, a casing, a pair of friction shoes forcooperating with said drum. an operatin arm for each shoe, said armsbeing pivotal y mounted in said casing, an armature pivotally mounted insaid casing, said armature being adapted upon movement about its pivotto operate said arms'to move said shoes with respect to said drum, saidcasing, armature, arms and shoes being rotatable as a unit, and astatlonary magnet for causing said movement of said armature about itspivot. 7. In combination, a drum, a caslng, a pair of friction shoesfor. cooperating with said drum, an operating 'arm for each shoe, saidarms being pivotally mounted in said casing, an armature pivotallymounted in said casing, said armature being adapted upon movement aboutits pivot to operate said arms to move said shoes with respect to saiddrum, said casing, armature, arms and shoes being rotatable as a unit,and a stationary magnet for causing said movement of said armature aboutits pivot, the armature and magnet being arranged relative to each otherso as to shoes and therefore said drum when said shoes are in engagementtherewith; a pivoted armature mounted to rotate with said arms, saidarmature upon being moved about its pivot causing the operation of saidarms to release said shoesfrom said drum; and a stationary magnet forcausing said pivotal movement of said armature.

9. In a combined main and auxiliary drive machine for an elevator car;mechanism for connecting the auxiliary drive machine and the car, saidmechanism comprising, a rotatable drum connected to the car to drive thesame, a casing connected to said auxiliary drive machine to be driventhereby, a pair of friction shoes for application to the periphery ofsaid drum, an operating arm for each of said shoes, said arms beingpivoted to said casing, and actuator springs for applying said shoes tosaid drum; a magnet; and an I armature hinged to said casing to beoperated by said magnet to move said arms about their pivots to releasesaid shoes from said drum against the force of said actuator springs,said casing wholly enclosing said drum, shoes, arms, springs andarmature and partially enclosing said magnet.

10. In combination, a, rotatable drum..a pair of friction shoes forcooperating with said drum, an operating arm-for each shoe, actuatorsprings for applying said shoes to said drum, a member movable in onedirection to operate said arms to effect the release of said shoes fromsaid drum against the force of said actuator springs, said member havingonly contact engagement with said arms and being moved in the oppositedirection by said springs upon their operation to apply said shoes tosaid drum, and a yielding stop for limiting the movement of said memberin the opposite direction.

11. In combination, a rotatable drum, a pair of friction shoes forcooperating with said drum, an operating arm for each shoe, actuatorsprings for applying said shoes to said drum, a pivoted member actingthrough said arms to release said shoes from said drum against the forceof said actuator springs, said member being swung about its pivot bysaid'actuator springs upon their operation to apply said shoes to saiddrum, and a yielding stop for limiting the movement of said member uponits being swung by said springs.

12. In combination, a rotatable drum, 9. pair of friction shoes forcooperating with said drum, an operating arm for each shoe, actuatorsprings for applyingsaid shoes to said drum,-a pivoted member actingthrough said arms to release said shoes from said drum against the forceof said actuator springs, said member being swung about its pivot bysaid actuator springs upon their operation to apply said shoes to saiddrum, and

an adjustable yielding stop for limiting the movement of said memberupon its being swung by said springs. I

13. In combination, a rotatable drum, a pair of friction shoes forcooperating with said drum, a pivoted arm for each shoe, actuatorsprings for applying said shoes to said drum, a pivoted armatureadapted, upon beingswung about its pivot to effect the release of saidshoes from said drum against the force of said actuator springs, amagnet adapted upon energization to swing said armature about its pivotto effect the release of said shoes from said drum, said actuatorsprings causing said armature to be swung back about its pivot upon thedeenergization out its pivot to efiect the release springs causing saidarmature to be swung back about its pivot upon the deenergization ofsaid magnet in causing said shoes to be applied to said drum, a kick-01fspring for assisting said actuator springs in swinging said armature,and an ad ustable spring stop to limit the movement of said armatureupon its being swung back about its pivot.

15. In combination, a drum, a pair of friction shoes for coo erationwith said drum, an operating arm or each shoe, an armature adapted uponactuation to operate said arms to move said shoes with respect to saiddrum, said shoes, arms and armature being rotatable as a unit, astationary magnet for actuating said armature, a switch, and meansactuated by said armature for causing operation of said switch.

16. In combination, a drum, :1 pair of friction shoes for cooperationwith said drum,

upon the actuation of said armature by said magnet,.to open said switch.

. In testimony whereof, we have signed our names to this specification.

DAVID L. LINDQUI ST. GEORGE W. LAUTRUP.

said coil, and a rod operated by said armature,

